Improvement in scroll-sawing machines



S. G. MASON.

Improvement in. Scroll-Sawing-Machines. 114,835.

Patented Mag 16,187

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SYLVESTER G. MASON, .OF ROCHESTER, NEW-YORK.

Letters Patent No. 114,335, dated May 16, 1871.

IMPROVEMENT m scRoLL-sAwme MIAYCHYINES.

The Schedule referred to in these Letters Patent and making part of the same.

I, SYLVESTER G. Mason, of Rochester, in the county of Monroe and State of New York, have invented certain Improvements in Strainers for Scroll- Saws, of which the following is a specification.

The object of my invention is to provide an effective sockets B, and is suspended over the saw-table upon a hanger, D, in the usual manner.

G is a deflecting cord of raw' hide, catgut, or other strong flexible material, which is attached at its extremities-to levers E; and

F isa strap, which embraces said cord at or near its center longitudinally, andl-is connected to the upper end of the saw S,,as is usual is this class of machines.

. The spring 'socket's B may be bolted to the bracket A, as shown in full lines in fig. 1; but I prefer to pivot them at the lower side to the bracket and provide a projectingarm,a, upon the upper side, through the e'nd'of which an adjusting-screw,passes, bearing upon the bracket, as indicated by the dotted lines at the right hand of fig. l. d d By this meansa rolling adjustment of the socket is obtained for the purpose of regulating the tension of the springs and cord 0. 7

The spring-holders B are rims of metal, provided upon their internal periphery with arms 0', against one side of which springs d, of rubber, or other similaryielding material, bear, and the length of these arms is such as to freely admit the hub of the star-wheels H between their inner ends, as shown in fig. 1.

The star-wheels H are also provided with arms 0, between which and the arms 0' the springs 11 are introduced; and when the form of the latter is cylindrical these arms are carved in opposite directions, as indicated in fig. 1, whereby the springs are more securely held 'in place and the compressing surfaces increased.

The levers E-are bifurcated to. embrace the starwheels and sockets B, as shown in fig. 3, and they are attached at one extremity to the stanwheels bybolts c and pins f,figs. l and 3, the latter passing through the arms 0, as indicated at. the left .offig. 1. Thus,

when the arms 0 and c are arranged in each of the sockets B and star-wheels H, as shown, an inward movement of the levers E produces an oscillation of the'star-wheels and consequent compression of the springs d. p

Itwill therefore be seen that, when a reciprocating motion is given to the saw, the cord 0 is deflectedat each downward stroke, the levers E oscillated as shownin. dotted lines in fig. l, and the tension of the compressed springs d thusv conveyed to the'saw through the cord and connecting-strap.

Since the length of the levers E considerably exceeds the radius of the star-wheels, and also since a certain amount of motion of the saw is permitted by the deflectingwcord 0 independently of the springs, it follows thatthe compression of the springs d is slight, and the result is a very equable strain upon the saw throughout the stroke. 1 v

The springs, when worn, may be replaced at a trifling expense, as, when made of rubber, they maybe readily obtained in the requisiteshape fromdealers.

The star-wheels H need no bearings except the ex tremities of the armsc, and they are kept imposition by the forks of the lever E, while the castings for the sockets, star-wheels, and bracket may be put together without mechanical'fitting further than drilling the bolt and pin-holes. 1

In fig. 2 I have shown a modification of .the spring sockets, in which the arms of thestar-wheels are straight, and the springs are blocks-of rubber compressed lengthwise, or composed of metal in a-spiral form, theformer being preferable;

The number of arms 0 0 may be increased according to the aggregate strength required in the springs.

In'case it should not be desirable to use the cord 0, the lever E- may be arranged nearly or quite horizontally and the strap 1 attached directly to the extremities.

VVhat'I claim as my invention is- 1. The lever E and star-wheel or head H, in combination with the fixed socket B and springs cl, ar-

ranged to operate substantially as set forth.

2. In combination with the deflecting cord 0, the

levers E and'springheads B H, constructed and arranged substantially as and for the purposes set forth.

SYLVESTER G. MASON.

Witnesses:

' F. H. CLEMENT, A.' H. SARGENT. 

